Lock



March 17, 1942. E. N. JACOB! 2,276,655

LOCK

Fild July 29, 1940 Edward NJECUDZ' 05 wywmg w Patented Mar. 17, 1942 I UNITED STATES ZZ ,6 f

or-rice- 7 10 Claims.

This invention relates to cylinder locks and refers particularly to the construction of the eccentric driving cam and the manner in which a driving connection is established between it and the cylinder.

In certain locks of this type, especially the socalled pin tumbler locks, if it is desired to have the key removable in both cylinder positions-- locked and unlockedit is necessary to have the cylinder turn 360. Obviously this requirement entails a lost motion driving connection between the cylinder and the eccentric driving cam as a full turn of the cam would restore the latch bolt or other mechanism actuated by the cam to its initial position, unless, of course, the connection between the cam and the bolt incorporated 10st motion. Inasmuch as this latter expedient is not always satisfactory, it is desirable to have the lost motion in the lock itself.

Heretoiore, however, the driving cam and the associated portions of the cylinder and casing were of comparatively costly construction and in addition diificulty was experienced in accurately defining the limits of cylinder rotation. I

Having these objections to past constructions in mind, the present invention proposes an improved manner of translating cylinder rotation into bolt actuation or the like.

To this end, it is an object of the present invention to provide a unique drivingcam swaged from a single piece of steel wire into the form of a crank and a novel manner of drivingly connecting the crank with the cylinder.

Another object of this invention resides in. the provision of a crank-like driving cam so assembled with the cylinder and easing that in addition to providing the desired lost motion, driving connection between the cylinder and cam, the limits of cylinder rotation are accurately defined through the medium of the cam.

More specifically it is an object of this invention to provide a lock structure of the character described wherein the midsection or arm of the crank-like driving cam is interposed between cooperating stop lugs on the casing and the cylinder to define the, limits of cylinder rotation.

A further object of this invention is to pro vide a lock device of the character described wherein the eccentric driving cam is held assembled with the cylinder by the act of securing the cylinder in its casing.

With the above and other objects in view which will appear as the description proceeds, this invention resides in the novel construction, combination and arrangement of parts substantially as hereinafter described and more particularly defined by the appended claims, it being under-' stood that such changes in the precise embodiment of the herein disclosed invention may be made as come within the scope of the claims.

The accompanying drawing illustrates one completeexample of the physical embodiment of the invention constructed according to the best mode so far devised 'for the practical application of the principles thereof, and in which: Figure 1 is a side View of a pin tumbler lock equipped with this invention and having parts thereof broken away and in section to more clear- 1y illustrate structural details;

Figure 2 is an end'view of the lock taken on the plane of the line 2--2 of Figure l and showing the parts in the positions they occupy when the driving cam is at one limit of motion;

Figure 3 is a view similar to Figure 2 showing the driving cam at its opposite limit of motion; Figure 4 is a perspective'view of the casing for the lock showing "particularly its inner end portion in which the driving cam is mounted;

Figure 5 is a perspective view of the cylinder per se; and I Figure 6 is a perspective view of the driving cam.

Referring now particularly to the accompanying drawing in which like numerals designate like parts, the numeral 5 designates the casing of a conventional pin tumbler lock having a bore 5 in which a cylinder 1 is rotatably mounted. The cylinder is secured in the casing by means of a locking bar 8 seated in 'a' transverse slot 9 in the casing and projecting into a groove [0 in the cylinder.

The customary pin tumblers and drivers indicated generally by the numeral II are carried by the casing and cylinder to secure the cylinder against rotation except when a proper key I2 is inserted into the keyway of the cylinder.

Attention is directed to the fact that the key is insertable and removable in only one position of rotation. This means that the cylinder must turn through 360 if the key is to be removable in both positions of the lock that is, locked and unlocked.

Key propelled rotation of the cylinder is transmitted to the bolt or other latch part to be controlled, not shown, through the medium of an eccentric driving cam indicated generally by the numeral l3.

This cam is swaged from a single length of steel wire into the form of a crank having an inner stem l4 and an outer stem l5 connected by a crank arm [6.

The stems l4 and [5 are axially offset but substantially axially parallel. The face I! of the arm from which the inner stem l4 projects is is determined by the location of stop abutments 2| and 22 formed by the inner edge of a segmentlike lug 23 projecting from the inner end of the cylinder radially outward of its socket 2B and with which the sides of the cam arm engage.

Hence, it will be seen that when the driving cam is properly assembled with the cylinder a lost motion driving connection is established therebetween.

The fiat inner face I! on the arm of the cam enables the arm to lie flat against the inner end of the cylinder to insure proper driving engagement between the stop abutments 2| and 22 and the opposite side edges of the arm. Further assurance of proper driving engagement is afforded by chamfering the edge of the socket as at 24.

This accommodates any possible irregularities or fillets at the junction of the cam arm and its stem M.

The cam is held assembled with the cylinderby having its arm l5 confined between the inner end of the cylinder and the inner surface of an end wall 25 which partially closes the inner end of the casing. This end wall has a substantially D-shaped hole 26 therethrough through which the outer stem [5 of the cam projects, but the size of the hole is such that a portion of the end wall 25 at all times overlies the ledge I!) extending-around the periphery of the arm l6.

It will also be noted that part of the cam strikes the opposite end portions of the straight edge of the D-shaped hole 26 at the two extreme positions of the cam and that the arm of the cam is thus interposed between the stop abutments 2| and 22 on the cylinder and the stop abutments formed by the straight edge of the D-shaped hole;

In view of the fact that these cooperating stop abutments are disposed a substantial distance outwardly from the axis of rotation, accuracy in defining the limits of cylinder rotation is thus assured.

From the foregoing description taken in connection with the accompanying drawing, it will be readily apparent that this invention provides an exceedingly simple manner of efiecting a lost motion driving connection between the eccentric cam and the cylinder of a lock of the type where cylinder rotation must exceed the motion of the cam,and that through the novel coaction which exists between thecam and the stop abutments on the cylinder and the casing, the desired accuracy in the location of the termini of cylinder rotationis achieved.

, What I claim as my invention is: g

1. In a lock of the character described: a bored casing having anend wallpartially closing the inner end of the bore, said end wall having a non-circular opening; a lock cylinder rotatable in. the bore; a segment-like projection on the inner end of the cylinder; and a crank-like driving cam assembled between the inner end of the cylinder and said end wall of the casing, said driving cam having a part engageable by the segment-like projection to provide a lost motion driving connection between the cylinder and the cam and being engageable with edge portions of the hole to define the limits of rotation of the cylinder.

2. In a lock of the character described: a casing; a cylinder rotatable therein, said cylinder having an axial socket in its inner end forming a cylindrical bearing; circumferentially spaced abutments on the end of the cylinder radially outward from said socket; and a driving cam substantially in the form of a crank having oppositely projecting axially ofiset stems connected by an arm, one of said stems being journalled in the socket for rotation on the axis of the cylinder so that the other stem rotates eccentrically about the axis of the cylinder at its inner end, and said crank arm being engageable by the circumferentially spaced abutments on said inner end of the cylinder so that the cylinder has a lost motion driving connection with the cam.

3. In a lock of the character described: a bored casing having an end wall partially closing the inner end of the bore; a lock cylinder rotatable in the casing bore; a one-piece driving cam held assembled with the cylinder and casing by being confined between said end wall of the casing and the adjacent inner end of the cylinder; and cooperating abutments on thecylinder and the cam to provide a lost motion driving connection therebetween.

4. In a lock of the type having a casing and a lock cylinder rotatable therein: a one-piece driving cam having axially offset stems joined by an arm to substantially form a crank, said arm cooperating with abutments on the lock casing and cylinder to provide rotation stops for the cylinder.

5. As an article of manufacture a driving cam for cylinder looks comprising a single unitary structure having axially offset oppositely projecting stems connected by an arm, said arm having a flat surface from which one of said stems projects and having a marginal portion substantially of uniform thickness to define a ledge around the periphery of the arm and uniformly spaced from the plane of said fiat surface, the other stem projecting from that side of the arm having the ledge so that the composite shape of the cam is substantially that of a crank.

6. In a lock of the character described: a cas ing having a bore partially closed at its inner end by a wall, said wall having a non-circular opening therethrough, certain edges of said opening constituting stops; a cylinder rotatable in the bore and having circumferentially spaced abutments projecting from the inner end thereof to provide stops and having an axial socket in its inner end; and a crank-like driving cam having oppositely extending axially offset stems connected by a crank arm extending at an angle to the axes of the stems, one of said stems being received in the socket and the other projecting through the hole in the casing end wall, the arm of the crank-like casing being interposed by the said stops to limit rotation of the cylinder and provide a lost motion driving connection between the cylinder and the cam.

'7. In a lock of the character described: a bored casing; a-lock cylinder rotatable in the casing bore; an end wall at the inner end of the casing bore, said end wall having a substantially D- shaped hole therethrough; the inner end of the cylinder having an axially located socket; a segment-like projection on the inner end of the cylinder; and a driving cam formed substantially as a crank and having parallel oiiset stems con nected by a medial crank arm, one of said stems being received in the socket of the casing and the other projecting through the D-shaped hole at the inner end of the casing, part of the crank arm being confined between the inner end of the cylinder and the inner surface of the end wall of the casing at all times and said segment-like projection being so proportioned with relation to the dimensions of the driving cam and the D-- shaped hole that the limits of rotation of the cylinder are defined by the interpositioning of part of the cam between said segment-like projection and the straight side of the D-shaped hole and whereby a lost motion driving connection is established between the cylinder and the cam.

8. In a key controlled cylinder lock of the type requiring 360 of cylinder rotation for insertion and removal of the key in both locked and unlocked positions, the combination of: a cylinder having an axial socket in its inner end and a segment-like lug projecting from the inner end of the cylinder and providing two circumferentially spaced stop abutments; and a crank-like driving cam having oppositely projecting axially parallel ofiset stems connected by a crank arm, one of said stems being received in the socket and the other being disposed eccentrically with respect to the axis of the cylinder, the face of the crank arm from which the first designated stem projects being shaped to lie snugly against the inner end of the cylinder so that the opposite side edges of the arm are engageable with the'stop abutments upon relative rotation between the cylinder and the driving cam, said arm of the driving cam and the stop lugs being so proportioned with respect to each other that a lost motion driving connection is established between the cylinder and the cam to swing the second designated stem of the cam through an arc of a predetermined number of degrees less than a full circle while the cylinder turns through 360.

9. In a key controlled cylinder lock of the type requiring 360 of cylinder rotation for insertion and removal of the key in both locked and unlocked positions, the combination of: a cylinder having an axial socket in its inner end and a segment-like lug projecting from the inner end of the cylinder and providing two circtunferentially spaced stop abutments; a crank-lik driving cam having oppositely projecting axially parallel offset stems connected by a crank arm, one of said stems being received in the socket and the other being disposed eccentrically with respect to the axis of the cylinder, the face of the crank arm from which the first designated stem projects being shaped to lie snugly against the inner end of the cylinder so that the opposite side edges of the arm are engageable with the stop abutments upon relative rotation between the cylinder and the driving cam, said arm of the driving cam and the stop lugs being so proportioned with respect to each other that a lost motion driving connection is established between the cylinder and the cam to swing the second designated stem of the cam through an arc. of a predetermined number of degrees less than a full circle While the cylinder turns through 360; and means on the casing overhanging part of the driving cam arm in all positions of the cam to hold the cam against the inner end of the cylinder.

10. In a key controlled cylinder lock of the type requiring 360 of cylinder rotation for insertion and removal of the key in both locked and unlocked positions, the combination of: a

cylinder having an axial socket in its inner end i one of said stems being received in the socket and the other being disposed eccentrically with respect to the axis of the cylinder, the face of the crank arm from which the first designated stem projects being shaped to lie snugly against the inner end of the cylinder so that the opposite side edges of the arm are engageable with the stop abutments upon relative rotation between the cylinder and the driving cam, said arm of the driving cam and the stop lugs being so proportioned with respect to each'other that a lost motion driving connection is established between the cylinder and the cam to swing the second designated stem of the cam through an arc of a predetermined number of degrees less than a full circle while the cylinder turns through 360; and

means on the casing engageable by a portion of the cam radially removed from the axis of its stem in the socket to limit cylinder propelled motion of the cam and thereby define the limits of rotation of the cylinder. l

EDWARD N. JACOBI.

CERTIFICATE OF CORRECTION. Patent No. 2,276, 655.- March 17, 19L 2.

' EDWARD N. JACOBI.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 2, second colmzm, line 62, claim 6, before "crank-like" insert onepieoe-; and

that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

.Signed and sealed this 5th day of May, A. D. 191;.2.

Henry Van Arsdale,

(Seal) Acting Commissioner of Patents. 

